The Digital Supplement to the Canadian Mathematical Society's Problem Solving Journal, for those who practice or teach mathematics. Published eight times per year, the materials at this site are available to all subscribers of CRUX; a sample issue is available for viewing by the public. News, information and subscription materials available to all. Crux Mathematicorum has merged with Mathematical Mayhem, a non-profit mathematical journal written by and for high school and undergraduate university students at the Univ. of Toronto, which appears 8 times a year, with articles, olympiads, and problems and solutions. Included in each issue are math-related articles on a variety of topics, and problems sections of various difficulties (High School, Advanced, and Challenge Board), to which readers may send in solutions and proposals for problems.